Fixed Mac Random Shutdown/Restart Issue on macOS Mojave


Fixed Mac Random Shutdown Restart Issue on macOS Mojave

Overview: Mac randomly shuts down after upgrading to macOS Mojave? We have come across situations where Mac shuts down/restarts randomly after upgrading to macOS Mojave. Today in this article we will troubleshoot random shut down and restarts issue on Mac.

Let’s Start with Few Practical Scenarios

Scenario 1: MBP Random Shutdowns With Mojave

My 2014 15″ Retina MBP started randomly shutting down around Labor Day running High Sierra.  After trying the Apple recommended approach with zero success I went to the internet and I found the tool NoCrashMBP and then the better fix which was renaming the ThunderboltEthernet KEXT to something else.   But I have just upgraded to Mojave and the renaming of the Thunderbolt file doesn’t seem to have worked. My machine keeps shutting down. So have gone back to NoCrashMBP. Anybody have an experience with Mojave and resolving the problem? And does anyone know if Apple is working on this problem which appears to have been around for a few years affecting a couple of years’ worth of this model?  I suppose it will go away by itself through natural attrition but given the price of these machines that doesn’t seem like an adequate view of customer service.

Source: Apple Forum

Scenario 2: Mac OS Mojave Random Shutdowns!!!!

I have a Mid-2014 MacBook Pro, 2.2GHz i7, w/Retina, 16 GB.  ‘Been a fantastic laptop for all this time. A few days ago I updated to Mohave (10.14.1) and now I’m experience frequent, random shutdowns. It will happen without warning and while in the first few days of Mohave it only happened a couple of times, now it is happened within just a few minutes of restarting.  I am typing this as fast as I can because it happened mid-post last time and I lost all the details I had put in.It is not an inactivity thing because it can happen while actively typing. I have no magnets or electronics near me so I’m not accidentally triggering the lid-closed signal (other threads have reported that as the problem), though I do admit the behavior is as if I closed the lid. Gonna post this to get the thread started before it crashes again.  Will post more details if needed.

Source: Apple Forum

Like the above two users, there are many Mac users who are facing random shut down and restarts issue on Mac. Let’s troubleshoot to fix it.

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Run Apple Diagnostics

It’s good to know if there is any hardware failure on your Mac. Run built-in Apple Diagnostics on your Mac. A bad hardware component may be responsible for random shut down.

To run a hardware test, do the following:

  • Plug out all the external devices except mouse, keyboard, Ethernet cable, and AC power connection.
  • Shut down your Mac.
  • Start your Mac and immediately press and hold the letter D key on the keyboard. Keep holding the D key until you see choose your language screen. It will automatically start the test, it may take a few minutes to complete the test, once the test completes it will provide you reference codes and let you know if there is any hardware failure.

Apple built in diagnostic

  • You can click Restart or press R to restart your Mac.

Restart Your Mac

Most of the time simple restart fixes the issue. Click on Restart from the Apple Menu and check your Mac.

Disable Startup Apps

  • Go to Apple Menu, select System Preferences
  • Click on Users & Groups and to Login Items. Here you will all the startup items. The apps which you don’t need, remove them by clicking on the name of the startup item and then click the minus button. Make sure you do not remove any important system apps.

Repair Disk Using Disk Utility on Your Mac

  • Go to the Apple menu > Restart, press and hold the Command and R keys until the Apple logo appears, then release the keys.
  • Click Disk Utility and click Continue.
  • Select View and then click on Show All Devices.
  • In the sidebar, select the disk you want to repair.
  • Click the First Aid button.
  • Click Run.

Clear the CacheFiles

Launch Finder and select Go to Folder and select Go.

Type in ~/Library/Caches and click Go.

Go into each of the folders and delete everything.

Keep the folders, but go into each one and delete the files inside

Now repeat the process but replace ~/Library/Caches with /Library/Caches

After this do not forget to empty the Trash.

Delete old iOS and iTunes backups which you do not need.

Uninstall the apps you no longer require

Clean up your desktop

Update Your Mac

Mac Software updates improve the stability, compatibility, and security of your Mac and updating mac might also resolve the random shutdown/restart issue.

To download macOS software updates, go to the Apple menu and select System Preferences and then click on Software Update.

You can also select Apple menu, choose About This Mac and then click on Software Update.

Update Your Software

An outdated or old version of the software may also be responsible for the random shutdown of your Mac. Most applications like browsers, photo or video editing software, games, etc. need to be updated regularly. Update your software regularly to use the latest version.

Start Mac in Safe Mode and Eliminate Software Responsible

  • Shut down your Mac.
  • Now start your Mac and immediately Press and hold the Shift key as soon as the start-up sound is heard.
  • Release the Shift key when you see the Apple logo. Safe Boot appears on the macOS Mojave start-up screen.

Safe Mode restricts the use of many applications on the system and allows examination in a more restricted environment. In case the Mac does not shutdown/restart in Safe Mode then you have to isolate the software which is causing shutdown/restart.

Reset SMC

  • Go to the Apple menu and shut down your Mac.
  • Once Mac shuts down, press and hold the Shift-Control-Option on the left side of the built-in keyboard, then press the power button at the same time. Hold these keys and the power button for 10-15 seconds.
  • Now Release all keys.
  • Press the power button again to turn on your Mac.

For Mac desktop computers

  • Go to the Apple menu and shut down your Mac.
  • Unplug the power cable.
  • Wait 15-20 seconds.
  • Plug in the power cable back.
  • Wait for 10 seconds and start your Mac.

Reset PRAM and NVRAM

  • Shut down Mac
  • After few seconds start the Mac and press and hold Option, Command, P and R keys on the keyboard together.
  • Hold the keys down till the Mac reboots and you hear a beeping sound.

Create Another Account on Mac

  • Go to the Apple menu, select System Preferences and then click on Users & Groups.

Users and group


  • Click on the lock icon to unlock it, put your administrator name and password.

Click on the lock Icon Mac

  • Now click on Add or Plus icon to create new account

Click on the plus icon

  • Click the New Account pop-up menu and then choose a type of user i.e. Administrator or Standard user and put all the necessary details and Click on Create User.

Admin account

Now check for random shut down, in case, it does not occur then old profile may have gone corrupt. Transfer all the data to the new account and start using your Mac.

Perform Clean Installation of macOS Mojave from USB flash drive

In case none of these steps works then performing a clean installation may help you to fix random shutdown/restart issue. Please note that you will lose all your data on the Mac. Visit this link to perform a clean installation: Apple link How to create a bootable installer for macOS

Check the Peripherals

  • Turn off your Mac.
  • Disconnect all peripheral devices. If you have a desktop Mac then disconnect all the external devices except Apple keyboard, mouse and monitor.
  • Turn on your Mac.
  • Use your Mac and check for random shutdown/restart. In case you don’t face shutdown/restart, shut down the Mac and connect one peripheral device at a time and test until Mac shutdown/restart. Continue to connect peripherals until you find the peripheral responsible for random shutdown/restart.

Reseat Apple Ram and Check Third-Party Hardware

  • Shut down your Mac.
  • Reseat the Apple RAM, and unplug the third-party RAM and third-party hardware in case you have installed any.
  • Turn on your Mac.
  • Use your Mac check for random shutdown/restart. In case you don’t face shutdown/restart then the third-party RAM or third-party hardware may need to be replaced.

Wrap Things Up

I hope this article helped you to fix random shutdown/restart on macOS Mojave.

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